drm/xe: implement VM_BIND decompression in vm_bind_ioctl

Implement handling of VM_BIND(..., DECOMPRESS) in xe_vm_bind_ioctl.

Key changes:
- Parse and record per-op intent (op->map.request_decompress) when the
  DECOMPRESS flag is present.
- Use xe_pat_index_get_comp_en() helper to check if a PAT index
  has compression enabled via the XE2_COMP_EN bit.
- Validate DECOMPRESS preconditions in the ioctl path:
  - Only valid for MAP ops.
  - The provided pat_index must select the device's "no-compression" PAT.
  - Only meaningful on devices with flat CCS and the required XE2+
    otherwise return -EOPNOTSUPP.
  - Use XE_IOCTL_DBG for uAPI sanity checks.
- Implement xe_bo_decompress():
  For VRAM BOs run xe_bo_move_notify(), reserve one fence slot,
  schedule xe_migrate_resolve(), and attach the returned fence
  with DMA_RESV_USAGE_KERNEL. Non-VRAM cases are silent no-ops.
- Wire scheduling into vma_lock_and_validate() so VM_BIND will schedule
  decompression when request_decompress is set.
- Handle fault-mode VMs by performing decompression synchronously during
  the bind process, ensuring that the resolve is completed before the bind
  finishes.

This schedules an in-place GPU resolve (xe_migrate_resolve) for
decompression.

Compute PR: https://github.com/intel/compute-runtime/pull/898
IGT PR: https://patchwork.freedesktop.org/series/157553/

v7: Rebase on latest drm-tip and add compute and igt pr info

v6: (Matt Auld)
   - Rebase as xe_pat_index_get_comp_en() is added in separate
     patch
   - Drop vm param from xe_bo_decompress(), instead of it
     extract tile from bo
   - Reject decompression on igpu instead of silent skipping
     to avoid any failure on Xe2+igpu as xe_device_has_flat_ccs()
     can sometimes be false on igpu due some setting in the BIOS
     to turn off compression on igpu.
   - Nits

v5: (Matt)
   - Correct the condition check of xe_pat_index_get_comp_en

v4: (Matt)
   - Introduce xe_pat_index_get_comp_en(), which checks
     XE2_COMP_EN for the pat_index
   - .interruptible should be true, everything else false

v3: (Matt)
   - s/xe_bo_schedule_decompress/xe_bo_decompress
   - skip the decrompress step if the BO isn't in VRAM
   - start/size not required in xe_bo_schedule_decompress
   - Use xe_bo_move_notify instead of xe_vm_invalidate_vma
     with respect to invalidation.
   - Nits

v2:
   - Move decompression work out of vm_bind ioctl. (Matt)
   - Put that work in a small helper at the BO/migrate layer invoke it
     from vma_lock_and_validate which already runs under drm_exec.
   - Move lightweight checks to vm_bind_ioctl_check_args (Matthew Auld)

Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Acked-by: Michal Mrozek <michal.mrozek@intel.com>
Signed-off-by: Nitin Gote <nitin.r.gote@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patch.msgid.link/20260304123758.3050386-8-nitin.r.gote@intel.com

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